On the 119 engine, it loosens the normal way (counter-clockwise). I had to use a floor jack under a breaker bar to get mine loose. Maybe this link will help, if you haven't already done the job.

http://www.peachparts.com/shopforum/showthread.php?t=190442&highlight=400e+water+pump

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles